Update installation instructions

* remove references to OpenBTS
* update URLs
* remove unnecessary requirements

Change-Id: I6ec26beaaa74dd3d98f27d110055a8f0cdd3c991
Related: OS#2600
diff --git a/INSTALLATION b/INSTALLATION
index 3e35d7e..0c0d205 100644
--- a/INSTALLATION
+++ b/INSTALLATION
@@ -2,32 +2,24 @@
 
 
 
-OpenBTS compiles to a simple Unix binary and does not require special
+osmo-trx compiles to a simple Unix binary and does not require special
 installation.
 
 One some systems (Ubuntu), you will need to define LIBS = -lpthread prior to
 running configure.
 
-To run OpenBTS, the following should be installed:
-
-	Asterisk (http://www.asterisk.org), running SIP on port 5060.
-
-	libosip2 (http://www.gnu.org/software/osip/)
-
-	libortp (http://freshmeat.net/projects/ortp/)
-
-	libusrp (http://gnuradio.org).
+To run osmo-trx, the following should be installed:
+	libuhd (https://gnuradio.org).
 	This is part of the GNURadio installation.
-	It is the only part used by OpenBTS.
 
 
-OpenBTS logs to syslogd as facility LOG_LOCAL7.  Please set your /etc/syslog.conf
+osmo-trx logs to syslogd as facility LOG_LOCAL7.  Please set your /etc/syslog.conf
 accordingly.
 
 
 For information on specific executables, see tests/README.tests and
 apps/README.apps.
 
-See http://gnuradio.org/redmine/wiki/gnuradio/OpenBTS/BuildingAndRunning for more
+See https://osmocom.org/projects/osmotrx/wiki/OsmoTRX for more
 information.